You may be conscientious of the ingredients—or even the macronutrients—in the meals you eat, but what about the chemicals used during crop production of your food? For the past two decades, journalist Cary Gillam has covered American agriculture and her book "Whitewash" chronicles what happens when agribusinesses place corporate interests over public safety. Gillam explains the potential health hazards of glyphosate, one of the most widely used herbicides, most commonly found in the weedkiller Roundup.